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Hd 4850 not getting enough power?

Last response: in Graphics & Displays
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September 26, 2010 3:17:51 AM

Operating System Microsoft Windows 7 Ultimate 64 bit

CPU Type DualCore AMD Athlon II X2 255, 3116 MHz

Motherboard Name ASRock N68-S UCC

Motherboard Chipset nVIDIA nForce 7025-630a, AMD K10

System Memory 2048 MB

Power Supply-
# 550 WATT ATX POWER SUPPLY (BASIC LOAD) 550-Watt
# Low noise dual 80mm fan
# Fan Speed Controller
# Short Circuit and Over-Voltage Protection
# Thermal Overload Cut-Off Protection

# Power Specifications:
# 115V, 230V 60/50 Hz switchable power supply
# +3.3V / 35A
# +5V / 45A
# +12V / 19A
# -12V / 0.8A
# -5V / 0.5A
# +5 Vsb / 3A

# Power Connectors:
# One (1) 14-inch 20+4-pin ATX power connector
# One (1) 14-inch 12V connector
# Two (2) SATA connectors
# Six (6) peripheral connectors
# Two (2) Floppy connectors

Bought a radeon hd 4850 off newegg, and I can't get it work properly. This psu doesn't any pci-e 6 pin power connectors.. So I had to buy a 3 to 1 molex splitter and use the 2 molex to 6 pin cable the card came with.

I have tried multiple times to get the drivers on here.. and all but one resulted in blue screen memory dump (the one time ccc wouldn't start). Posting on another forum, someone pointed out it was the psu that was the problem.. He is prob right since this one is a piece of junk.. But I'm still not 100% sure...

Also, every screen with my monitor hooked up to it is really pixelated.. All the boot up screens are horrible.. and here my desktop screen shot:
http://i51.tinypic.com/t0k9yt.jpgp

More about : 4850 power

a b ) Power supply
September 26, 2010 4:15:42 AM

Wow, only 19A ~ 12V rail on 550W PSU...
That's a BAD PSU. Get a new PSu with good quality, buddy. Your PSU is just too weak to run HD4850. Seriously, do not cheap out on PSU, that's the most important thing inside your PC...
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September 26, 2010 2:08:10 PM

All right thanks!

Should I get a Corsair TX650?
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a b ) Power supply
September 26, 2010 3:10:31 PM

Yes, TX650 is more than enough to run HD4850 and good to run ANY single card for the future, also a couple of dual card depend on their model)... :) 
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a c 164 ) Power supply
September 26, 2010 8:59:00 PM

you can run two 4850's off a Corsair TX650.
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September 28, 2010 12:24:39 AM

Could the pixelation be a monitor issue? I got a westinghouse L1928nv 19" (Had it for like 3 or 4 years).. Is the power supply really causing the white lines? I read somewhere that if you do a printscreen and the picture doesn't have the lines in it, its your monitor.. When I did that, sure enough the printscreen came out good.
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a b ) Power supply
September 28, 2010 1:27:03 AM

Alright, you can try another monitor just to make sure whether the monitor or your PSU is being faulty...
Again, like i said before, you will better with a new PSU, your current PSU is just too weak.
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October 6, 2010 9:56:22 PM

Got a new psu:

Coolmax VL-600B 600W

+5V@24A

+3.3V@24A

+12V1 @18A

+12V2@18A

+12V3@15A

-12V@0.5A

+5VSB@2.8A

This psu also has a direct 6-pin pci-e coming from the power suplly..

I unistalled all ati stuff (through control panel and driver sweep), shut down after each, plugged the card in, went into device manager and disabled the onboard nvidia chip, restart, went into bios, changed primary display driver from onboard to pci-e, saved, exited, booted up with all pixelated screens again..


So, I go onto ati's website to get the drivers, and notice this under ATI Radeon™ HD 4850 Graphics:

1. HD capable monitor required
2. Blu-ray drive required

I have neither of those... what should I do now?

My monitor is an old Westingtonhouse L1928NV 19 inch lcd...


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